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Related Manuals for Mad Bean Pedals VFE Switching Board V.2
Summary of Contents for Mad Bean Pedals VFE Switching Board V.2
- Page 1 VFE Switching Board v.2 © 2017 madbeanpedals 2.15” W x 1.33” H...
- Page 2 New for 2017 – v2 changes There are a number of changes to the v.2 switching board. These changes were made to conform to my personal preferences with effects building and what I perceive most DIY will appreciate. My only intention is to make the process of building the VFE projects slightly easier and to require less workarounds for different styles of building.
- Page 3 I Give You Infinite Powers The DC Jack inserts into +9v. Power is reverse-polarity protected via D1. It then passes through a 1mH inductor which creates a low pass filter with the C1 decoupler. This helps reduce noise and minimize ripple on the DC power (additional 100n decoupling caps are used on the audio boards).
- Page 4 Controllers, Coils and Things The 5v tap connects to the micro-controller (IC1: PIC12F509) for power. The relay coil (TQ2-L-5v) connects to pins 3 and 6 on the PIC. Pin4 of the PIC connects to ground via a 1k resistor and momentary switch. When the momentary switch is depressed, the PIC “reads”...
- Page 5 Whar Signal Goes? Whar??!!! The Switching Board utilizes an effect-input grounding scheme. IOW, when the audio circuit is bypassed its input is grounded. A 10M pull-down is used in all VFE projects. For the v.2 board, J1_ALT and J2_ALT have been added. These are used for those who do not wish to use PCB mounted jacks and are duplicates of the J1 and J2 I/O connections.
- Page 6 You Grounded, Bro? You might realize at this point that the entire circuit it ground isolated. IOW, there is no chassis grounding point with the Switching Board or the hardware attached to it (same goes for the audio boards). Therefore, we need to create a ground path to the chassis.
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Page 7: Shopping List
B.O.M. Zener Chart Resistors Diodes Alpha Dog, Blues King, 1N5817 Distortion3, The Scream Zener 100k 1n914 Blueprint, Bumblebee, Choral 100k Inductor Reef, Dark Horse, Fiery Red Horse, Focus, Mobius Strip, Old School, Pale Horse, Transistors BS170 Springboard, The Triplet, Caps J175 Triumvirate, Tractor Beam, White 150uF... - Page 8 For convenience, I have created a MOUSER project for the Switching Board components. This is specifically for the “v2” board. If using the previous version of the switching board, please see the link to the Mouser project in that document. Mouser Project: VFE_SwitchingBoard v.2 https://www.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=361b06ad90 Notes:...
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Page 9: Wiring Diagram
Wiring Diagram 1 This example shows the Tractor Beam wiring. It includes split-rail power, PCB mounted input and output jacks and the battery hookup. When using PCB mounted jacks, solder a wire from the “G” pad next to the inductor to the lock- washer of the momentary switch (which is inserted over the momentary switch when boxing it up). - Page 10 Wiring Diagram 2 This example shows the Old School. That project does not use a split-rail power scheme so all the stuff in the gray box is left off. Notice that there is no wire connecting the V- pads on the two boards since it doesn’t need -9v. This example also shows how to wire non-pcb-mounted jacks (if that is your preference).
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Page 11: Drill Template
Drill Template 1 For use only with the v.2 Switching Board Use this template for board-mounted jacks and battery. - Page 12 Drill Template 2 For use only with the v.2 Switching Board Use this template for wired jacks and no battery.
- Page 14 Building the Board This is how you get the board, with the VFE PIC already installed. You do not want to use IC sockets on the Switching Board because the PCB sits on top of the momentary switch and there won’t be enough room if sockets are used. I generally load almost everything and solder in one go.
- Page 15 When soldering on the jacks, I use a little bit of BluTac to hold them in place. For the switch, I recommend soldering on the two wires facing up like this. The switch and 150uF cap will be close together when things are boxed up, and having the wires out of the way will help a lot. For the grounding, solder a wire to a lock washer like so.
- Page 16 Lock washer temporarily put on the switch to keep it out of the way while the build is completed. All the wires are installed and the whole thing is ready for testing.
- Page 17 You don’t necessarily have to test the switching separate from your entire build. You can just as easily wire everything to your audio board and test everything at once. I did it this way because this was built specifically for this guide. I hooked the effect input and output wires on the breadboard so I could test that signal was passing in both states: bypass and effect.
- Page 18 The board goes over the momentary switch. This is an older enclosure drilled to spec on the previous Switching Board, so the DC jack is drilled for the wrong spot. No worries, the Drill Guide in this doc works just fine for this board. Here is a quick video of the board being tested and a demo of how to switch between latching and momentary modes: https://www.youtube.com/watch?v=WvKMa8v0OvE...